package thread;

class Counter {
    private int count = 0;
    synchronized public void add() {
        count++;
    }
    synchronized static void func2() {
        //....
    }
    static void func() {
        synchronized (Counter.class) {
            //...
        }
    }
    public int get() {
        return count;
    }
}

public class Demo20 {
    public static void main(String[] args) throws InterruptedException {
        Counter counter = new Counter();
        //Object locker = new Object();

        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.add();
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.add();
            }
        });

        t1.start();
        t2.start();
        t1.join();
        t2.join();

        System.out.println("count = " + counter.get());
    }
}
